Table of Contents
- 1 Why are there less than 61 tRNA?
- 2 Why are there fewer tRNA Anticodons?
- 3 Why does the cell require only 32 different tRNAs to recognize 61 different codons?
- 4 Are there 61 different tRNAs?
- 5 Why are there only 45 different tRNA Anticodons?
- 6 How does DNA polymerase differ from RNA polymerase?
- 7 How many tRNAs are required to translate all 61 codons?
- 8 How many different tRNAs are there for arginine?
- 9 How many tRNAs can be attached to one codon?
- 10 Why don’t we have 61 codons in RNA?
- 11 Why is there only 64 tRNA per amino acid instead of 64?
Why are there less than 61 tRNA?
The reason why less than 61 tRNAs are required is because of the “wobble pairing” between anticodon and codon. As shown in the following figure, base pairing does not obey the standard Watson-Crick pairing at the wobble position. One base can pair with several other bases.
Why are there fewer tRNA Anticodons?
Why are there fewer tRNA anticodons than the 61 needed to match each mRNA codon that codes for an amino acid? There is some flexibility in pairing between the 3′ base of the codon and the 5′ base of the anticodon. what happens during RNA splicing in eukaryotes?
Why are there fewer than 64 different tRNA molecules?
Because there are four amino acids that could comprise each of the three bases in a codon, there are 4^3 = 64 possible codons. Some codons code for the same amino acid, and so the actual number of tRNA molecules needed is less than 64. This redundancy in the genetic code is referred to as “wobble.”
Why does the cell require only 32 different tRNAs to recognize 61 different codons?
Why then does the cell require only 32 different tRNAs to recognize 61 different codons? Ans: Certain tRNAs have the unusual nucleotide inosinate in the first anticodon position. Because inosinate can base pair with A, U, or C, a tRNA containing hypoxanthine can recognize three different codons.
Are there 61 different tRNAs?
There is a tRNA formed to match its codon with a single type of amino acid. Although there are 61 different codons that code for the 20 amino acids, there are only 45 different tRNAs because the third base in the tRNA anticodon can recognize two or more different codons on a mRNA.
Is it necessary for a cell to make 61 different tRNA molecules corresponding to the 61 codons for amino acids explain your answer?
Is it necessary for a cell to make 61 different tRNA molecules, corresponding to the 61 codons for amino acids? Explain your answer. No, it is not. Due to the wobble rules, the 5 base in the anticodon of a tRNA can recognize two or more bases in the third (3) position of the mRNA.
Why are there only 45 different tRNA Anticodons?
Although there are 61 different codons that code for the 20 amino acids, there are only 45 different tRNAs because the third base in the tRNA anticodon can recognize two or more different codons on a mRNA. This ability to recognize different codons is called wobble.
How does DNA polymerase differ from RNA polymerase?
The main difference between DNA and RNA polymerase is that DNA polymerase produces a double-stranded DNA molecule during polymerization whereas RNA polymerase produces a single-stranded RNA molecule during transcription.
How do tRNA molecules differ from each other?
One end of the tRNA binds to a specific amino acid (amino acid attachment site) and the other end has an anticodon that will bind to an mRNA codon. One end of the L shape has the anticodon, while the other has the attachment site for the amino acid.
How many tRNAs are required to translate all 61 codons?
31 tRNAs
However, many cells have under 61 types of tRNAs because the wobble base is capable of binding to several, though not necessarily all, of the codons that specify a particular amino acid. At least 31 tRNAs are required to translate, unambiguously, all 61 sense codons.
How many different tRNAs are there for arginine?
| A. | 0 – there are no tRNAs that carry Arginine |
|---|---|
| B. | 1 – the same tRNA can carry any amino acid and the ribosome determines the sequence based on the anticodon |
| C. | 1 – there is a different tRNA for each amino acid. So 20 different types of tRNA total |
| D. | 6 – each codon will bind to a tRNA with a commentary anticodon |
Why are there only 45 tRNAs when there are 61 mRNA codons?
How many tRNAs can be attached to one codon?
Thus the number of tRNAs in most cells is more than the number of amino acids used in protein synthesis (20) and also differs from the number of amino acid codons in the genetic code (61). Consequently, many amino acids have more than one tRNA to which they can attach ; in addition, many tRNAs can pair with more than one codon.
Why don’t we have 61 codons in RNA?
The reason you don’t need 61 codons is because the third nucleotide in the codon in the RNA-RNA hybrid that characterizes the mRNA-tRNA codon-anti There are 20 different amino acids plus a termination signal. There are only four nucleotide bases.
What direction do the anticodons bind to the tRNA?
Furthermore, as codons are read in the 5’ to 3’ direction, anticodons present on the tRNA are positioned in the 3’ to 5’ direction. The codon, anticodon and tRNA for the amino acid Alanine (Photo Credit : Yikrazuul/Wikimedia Commons) This means that the 1st codon base binds to the 3rd anticodon base and so on.
Why is there only 64 tRNA per amino acid instead of 64?
If you have a look at the codon table for amino acids, than the variation in the code for one amino acid mostly happens on the third position (from here ): This allows a smaller number of tRNA than 64, as there is some flexibility. The third base can be represented like this (taken from this answer):